/**
 * Copyright (c) 2019-2021,  陈俊兵 (cjb6b.com@gmail.com)
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.ktjiaoyu.advance.lockupgrade;

/**
 * 锁粗化测试
 * @packageName com.ktjiaoyu.advance.lockupgrade
 * @fileName CoarseningLockTest.java
 * @author 陈俊兵 (cjb6b.com@gmail.com)
 * @createTime 2023/7/26 23:20
 * @lastModify 2023/7/26 23:20
 * @version 1.0.0
 */
public class CoarseningLockTest {

    static Object objLock = new Object();
    public static void main(String[] args) {
        // 先演示锁粗化的性能提升
//        long start = System.currentTimeMillis();
////        synchronized (CoarseningLockTest.class) {
//            for (int i = 0; i < 100000000; i++) {
//                synchronized (CoarseningLockTest.class) {
//
//                }
//            }
////        }
//        long end = System.currentTimeMillis();
//        System.out.println(end - start);

        // 反复加锁、解锁
        new Thread(() -> {
            long start = System.currentTimeMillis();
            for (int i = 0; i < 10000; i++) {
                synchronized (objLock) {
                    System.out.println("a");

                    System.out.println("b");

                    System.out.println("c");
                }
            }
            long end = System.currentTimeMillis();
            System.out.println(end - start);
        }, "t1").start();

    }
}
